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Beam bridges)
| Beam Bridge
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| This footbridge was made from beams and boards obtained from logs from the surrounding forest
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| Ancestor | Log bridge
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| Related | None
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| Descendant | Plate girder bridge, trestle, truss bridge, moon bridge
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| Carries | Pedestrians, automobiles, trucks, light rail, heavy rail
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| Span range | Short
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| Material | Timber, iron, steel, reinforced concrete, post-stressed concrete
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| Movable | No
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| Design effort | low
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| Falsework required | No, unless cast-in place reinforced concrete is used
|
A
beam bridge is a rigid, horizontal structure that is resting on two piers, one on each end. The weight of traffic presses down on the beam. The force of the weight causes compression on the top of the beam and causes tension on the bottom of the beam. The span of a beam bridge is about 200 feet. It is a direct descendant of the
log bridge now made from shallow steel "I" beams, box beams (hollow rectangular tubes),
reinforced concrete, or
post-tensioned concrete (concrete with tubes for cable tendons). It is frequently seen in pedestrian bridges and for highway overpasses and flyovers. As is its ancestor, this bridge is in structural terms the simplest of the many bridge types.
es:Puente viga
sv:Balkbro
